Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues	$ 10,787	$ 9,684	$ 21,722	$ 19,893
Cost of revenues	5,615	5,075	11,195	9,968
Gross profit	5,172	4,609	10,527	9,925
Operating Expenses:
General & administrative	1,457	1,334	3,308	2,809
Marketing & selling	1,301	1,244	2,540	2,487
Research & development	358	321	717	651
Total Operating Expenses	3,116	2,899	6,565	5,947
Operating income	2,056	1,710	3,962	3,978
Other income (expense)	24	(12)	56	(34)
Net income before provision for income taxes	2,080	1,698	4,018	3,944
Provision for income taxes	903	791	1,590	1,537
Net income	1,177	907	2,428	2,407
Other Comprehensive Income (Loss):
Foreign currency translation	(1,154)	(71)	(1,165)	(71)
Total Comprehensive Income	$ 23	$ 836	$ 1,263	$ 2,336
Basic net income per share (in dollars per share)	$ 0.21	$ 0.17	$ 0.44	$ 0.44
Diluted net income per share (in dollars per share)	0.21	0.16	0.44	0.44
Dividends declared per share (in dollars per share)	$ 0.18	$ 0.15	$ 0.36	$ 0.30